iOS开发---引导页设置

<span style="color: rgb(153, 153, 153); font-family: 'microsoft yahei'; font-size: 13px;">APP下载安装首次使用显示启动引导页然后进入主界面，非首次安装APP则直接进入主界面</span>

if (![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];        FMLog(@"首次启动");        LeadPageController *tabBar = [[LeadPageController alloc] init];        self.window.rootViewController = tabBar;    }else{        FMLog(@"非首次启动");        BaseTabBarController *basetabBarVC = [[BaseTabBarController alloc] init];        self.window.rootViewController = basetabBarVC;    }